Supercross Champion Jeff Emig as takes us through the big changes on the 2012 Kawasaki KX450F. Emig shows off the major advances that Kawasaki has made to the 2012 KX450F, including race-inspired Launch Control Mode, which is tuned to maximize traction out of the starting gate. With the advances on the 2012 Kawasaki KX450F, the green machines continue to stay on the leading edge oftechnology.